Attachment plug



Feb. 23, 1932. T O H E 1,846,251

ATTACHMENT PLUG Filed Sept. 11, 1929 L aiiizea fimizaiae, W

I dially Patented Feb. 23, 1932 UNITED STATES PATENT OFFICE TAKES P. '1.DONAHUE, OF CHICAGO, ILLINOIS ATTACHMENT .PLUG

Application fled September 11, 1929. Serial No. 391,910.

This invention relates to electrical terminal centrally located openingin its back for admitting the conductor wires which were attached to thecontact elements secured to the body. That type of plug wasobjectionable "for many reasons. When the conductor extends through theback of the plu it forms a convenient handle which the user is temptedto employ in removing the plug from its socket, with the result that thewires are frequently jerked from the contact blades and the blades areloosened, therebyl damaging the plug and often causing a s ort circuit.Frequentl the wires and plug have been damaged y an unintentionaljerking of the conductor, as for instance when the plug has been used inconnection with a moving appliance such as a vacuum cleaner, fiat iron,curling iron, soldering iron and the like.

Such prior types of plugs were also 0bjectionable in cases where it wasnecessary that the wires extend laterally from the plug,-

for the reason that the frequent bending of the wires adjacent the plugruptured the insulation and often caused a short circuit. The weight ofthe conductor also sometimes caused the plug to tilt so as to loosen itfrom the socket.

The main objects of this invention are to provide an improved form ofterminal plug which is constructed so as to compel the use of the plugbody as a handle gri in removing the plug from its socket therebypreventing the damage to theplu and wires resulthug from the jerking oft e conductor; and to provide a plug of prevent the necessit ductorwires thereo from the plug.

An illustrative embodiment of this invention is shown in theaccompanying drawings, whereinz igure 1 is a side elevation of animproved terminal plug, showing also a portion of a conductor.

Fig. 2 is a bottom plan of the same.

of bending the conwhen they extend raadjacent the passageway to thiskind which will 'Fig. 3 is a transverse section taken on the line 3-3 ofFig. '2.

Fig. 4 is a side elevation of the plug, taken from the right of Fig. 1and showing the. conductor in section.

In the construction illustrated, the improved terminal plug comprises abody 1,

on which is mounted a pair of: contact blades 2 connected toconductorwires 3.

The body 1 is made of any suitable insu-. lating material and may be ofan desired shape, although the dome shape ilustrated in the drawings ispreferred. Extending around the body 1, is a bearing portion 4, whichforms a convenient finger ip in the handling of the plug. The dome-saped back 5 of the body is completely closed and the face 6 is providedwith a recess 7 forming a seat for the contact blades. A-partition 8extends radially inwardly from one side of, the body to form aninsulation between a pair of binding posts 9 to which the wires 3 areattached.

Formed within the body 1, is a radially disposed passageway 10 for thewires 3. The

dome-shaped back 5 of the body is enlarged form a boss 11 having asubstantially flat side wall 12 in which the inlet of the passageway, islocated.

The passageway is disposed substantially in alinement with the partition8, so as to permit the wires 3 to extend radially from the binding postsso as to avoid the objectionable bending of the wires.

The contact blades 2 project beyond the face 6 in substantially parallelspaced relation to each other, and are provided with base portions 13which are secured to the body 1 by rivets 14 and by the binding posts 9.With this improved form and arrangement of parts, the conductor wirescannot effect-ively be used as a handle for withdrawing the plug fromits socket. The user must grip the body 1 in handling the plug. Also,when this improved lug is used in connection with a wall soc et, theconductor may ban in close proximity to the wall without ben ing.

. Although but one specific embodiment of this invention has been hereinshown and described, it will be understood that certain details of theconstruction shown may be altered or omitted without de arting from thespirit of this invention as efined by the 5 following claims.

I claim: 1. A terminal plug'comprising a substan tially semi-sphericalbody having a closed 7 back, a pair of spaced contact members 10 mountedon said body and projecting beyond the face thereof, a pair of terminalssecured to said contact members for the attachment of conductor wires,said body having a portion disposed between'said terminals to form apartition, and a radially disposed passageway formed in said body andhaving an inlet opening in one side of said body for admitting thewires, said passageway being in radial alinement with said partition,said terminals and said inlet opening being disposed on respectivelyopposite sides of said contact members.

2. A terminal lug comprising a body having a closed bac a pair of spacedcontact 2 members mounted on said body and rojecting beyond the facethereof, a pair 0% terminals secured to said contact members for theattachment of conductor wires, said body having a portion disposedbetween said ter- 1 minals to form a partition, and a radially disposedpassageway formed in said bodfy and having an inlet opening in one side0 said body for admitting the wires, said passageway being in radialalinement with said artition, said terminals and said inlet opemng beingdisposed on respectively opposite sides of said contact members.

Signed at Chicago this 7th day of September, 1929 40 JAMES P. T.DONAHUE.-

